PLC Programmable Controllers: Type - Programmable Logic Controller; I/O - 12; Digital Inputs - (8) 24VDC; Digital Outputs - (4) Transistor; Voltage - 24VDC; Memory - 7920 Step Program, 5000 Word Data; Communication Ports - (1)RS-232 (1) RS-485; Programming - ELCSoft; Included Functions - Real Time Clock, 2 Potentiometers; Manufacturer Series - ELC